Synergy of surface-treated nanoparticle and anionic-nonionic surfactant on stabilization of natural gas foams

摘要

Positively charged surface-treated nanoparticle (S-AK) and anionic-nonionic surfactant sodium fatty alcohol polyoxyethylene ether sulfate (AES) mixture has been used to obtain natural gas foams. It was found that synergy occurs between S-AK and AES in generating stable natural gas foams due to the foam stability of the S-AK/AES mixture being better than that of either single component. It is important to control the contents of two species since there are optimum concentrations for S-AK and AES on stabilizing Natural gas foams. High salinity ( = 50,000 mg L-1) is conducive to the stability of S-AK/AES natural gas foams at high temperature (50 degrees C). In addition to the electrostatic interaction, EO groups significantly promote the attraction between S-AK and AES. The stability of S-AK/AES natural gas foams may relate to two aspects: one is that AES-adsorbed nanoparticles migrate to the gas/liquid interface and enhance the interfacial dilatational elasticity, and the other is that a rigid skeleton structure forms in the natural gas foam films by the flocs consisting of S-AK and AES. Natural gas foams are most stable when the monolayer adsorption of AES molecules on the S-AK surface occurs in the dispersion.